Improvements

• Eliminate syntect library's dependency on serde's "derive" feature. Increases build parallelism.
• Add parsing of gutterSettings.

Dependencies

• Update regex-syntax to 0.8.

Improvements

• Fix how syntect::util::split_at() handles multi-byte characters
• Allow case insensitive search for .tmtheme paths
• impl PartialEq for Theme

Dependencies

• Upgrade fancy-regex to 0.11
• Upgrade regex-syntax to 0.7
• Replace lazy_static with once_cell

Other

• Change MSRV policy to "last three stable versions"
• Make Debug impl of syntect::highlighting::Color less verbose

Thanks to @Enselic for basically all the work to make this release happen!

Breaking changes

• Lazy-load syntaxes to significantly improve startup time. This changes the binary format of syntax dump files.
• Remove ContextId::new() from public API to support lazy-loading of syntaxes
• Rename HighlightLines::highlight() to HighlightLines::highlight_line() to make it clear that the function takes one line at a time
• Make plist dependency (used for loading themes) optional via new plist-load feature
• Remove obsolete dump-load-rs and dump-create-rs features that has been identical to dump-load and dump-create for two years
• Remove deprecated items ThemeSettings::highlight_foreground, ThemeSettings::selection_background, ClassedHTMLGenerator::new, ClassedHTMLGenerator::parse_html_for_line, html::css_for_theme, html::tokens_to_classed_html and html::tokens_to_classed_spans
• Mark all error enums as #[non_exhaustive]
• These functions have been changed to return a Result to allow propagation of errors:
  • html::ClassedHTMLGenerator::parse_html_for_line_which_includes_newline
  • html::append_highlighted_html_for_styled_line
  • html::css_for_theme_with_class_style
  • html::highlighted_html_for_string
  • html::line_tokens_to_classed_spans
  • html::styled_line_to_highlighted_html
  • parsing::ParseState::parse_line
  • parsing::ScopeStack::apply
  • parsing::ScopeStack::apply_with_hook
  • parsing::syntax_definition::Context::match_at
  • parsing::syntax_definition::ContextReference::id
  • parsing::syntax_definition::ContextReference::resolve

Other changes

• Fall back to Plain Text if a referenced syntax is missing
• Add support for hidden_file_extensions key in syntaxes.
• Implement Error and Display for all error enums by using thiserror
• Replace lazycell with once_cell to fix crash on lazy initialization
• Add ScopeRangeIterator
• Add CI check for Minimum Supported Rust Version. This is currently Rust 1.53.
• Make looking up a syntax by extension use case-insensitive comparison
• Make from_dump_file() ~15% faster
• Blend alpha value on converting colors to ANSI color sequences
• Fix sample code in documentation to avoid double newlines
• Fix lots of build warnings and lints
• Add Criterion benchmarks for a whole syntect pipeline and for from_dump_file()

See the release notes for v4.7.0, this release removes a new Cargo feature which constituted a semver violation:

• Remove 'plist-load' feature again due to semver violation. #403

Big release this time thanks to tons of fantastic contributions from @Enselic, this release was basically all him! The headline feature is much faster startup time due to lazy-loading at the syntax level.

• Lazy-load syntaxes to significantly improve startup time
• Remove ContextId::new() from public API to support lazy-loading of syntaxes. This is technically a breaking change but I have no idea why I made this API public and I'm pretty sure zero people have used it.
• Add ScopeRangeIterator
• Add CI check for Minimum Supported Rust Version. This is currently Rust 1.51.
• Make 'plist' dependency (used for loading themes) optional via new 'plist-load' feature
• Make looking up a syntax by extension use case-insensitive comparison
• Make from_dump_file() ~15% faster
• Blend alpha value on converting colors to ANSI color sequences
• Fix sample code in documentation to avoid double newlines
• Fix lots of build warnings and lints
• Add Criterion benchmarks for a whole syntect pipeline and for from_dump_file()
• Replace lazycell with once_cell to fix crash on lazy initialization

• Add html::line_tokens_to_classed_spans to also take a mutable ScopeStack, deprecate tokens_to_classed_spans, to avoid panics and incorrect highlighting.
• Derive Hash for Color and Style
• Add find_unlinked_contexts to SyntaxSet
• Add syntaxes method to SyntaxSetBuilder
• Bump fancy-regex to v0.7 and yaml-rust to v0.4.5

• Added a new function for producing classed HTML which handles newlines correctly and deprecated old one. #307

• Errors are now Send + Sync + 'static #304

I also forgot to make a Github release for v4.3.0 but released it on crates.io so belatedly in v4.3.0:

• Fixes unnecesary dependency of the html feature on the assets feature. #300
• Adds ability to add prefixes to html module CSS class names. #296

• Updates to new versions of onig and plist. The new onig version doesn't require bindgen thus making compilation easier. #293

• Properly handle backreferences in included contexts #288